[CI] Enable Linux nightly main on PRs #101

Job	Run time
Unit tests / Construct unit test matrix	11s
Soundness / API breakage check	53s
Soundness / Documentation check	1m 9s
Soundness / Broken symlinks check	2s
Soundness / License headers check	8s
Soundness / Format check	34s
Soundness / Shell check	35s
Soundness / Unacceptable language check	5s
Soundness / Python lint check	4s
Soundness / YAML lint check	2s
Integration test / Linux (5.9)	1m 37s
Integration test / Windows (6.0)	1s
Integration test / Windows (nightly-6.0)	3s
Integration test / Linux (5.10)	1m 45s
Integration test / Linux (6.0)	1m 49s
Integration test / Windows (nightly-main)	1s
Integration test / Linux (nightly-6.0)	2m 15s
Integration test / Linux (nightly-main)	33s
Unit tests / Unit tests / Linux (5.9)	43s
Unit tests / Unit tests / Linux (5.10)	47s
Unit tests / Unit tests / Linux (6.0)	47s
Unit tests / Unit tests / Linux (nightly-6.0)	58s
Unit tests / Unit tests / Linux (nightly-main)	58s
	16m 0s

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